Boiler.



Patepted Dec. 30, 1913.

R. G. FRITZ.

BOILER.

APPLICATION FILED SEPT. Z3

COLUMBIA PLANOGRAPH co..wAsmNGToN, u. c.

ROBERT G. FRITZ, OF LOSANGELES, CALIFORNIA.

BOILER.

Specification of Letters Patent.

Patented Dec. 39, 1913.

Application led September 23, 1912. Serial No. 721,976.

To an whom t may concern.'

Be it known that I, ROBERT G. Fnrrz, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented a new and useful Boiler, of which the following is a specication.

The object of this invent-ion is to provide a boiler in which the re circulates around the tubes, the water being contained in the tubes and with inner flues extending through the center of the water tubes to permit the heat from the lire to pass through the center of the tubes containing the water.

A further object is to conduct the steam through a series of coils arranged around the tubes to dry the steam before it is used.

Referring to the drawings :*Figure 1 is a vertical section through the boiler. Fig. 2 is a section on line ce2-m2, Fig. 1. Fig. 3 is a section on line wit-x3, Fig. 1.

The boiler comprises an upper cylindrical section 1, providing an upper water and steam chamber, and a lower cylindrical section 2, providing a lower water chamber, the upper section having anged heads 3 and 1 riveted thereto and the lower section having flanged heads 5 and G. The space between the upper and lower sections provides an intermediate heating chamber between them. The sections are connected through the intermediate heating chamber by large water tubes 7 of which there are many. In addition to this, the sections are also connected through the intermediate heating chamber by four water circulation pipes 8, only one of which is seen in dotted line in Fig. 1, but all four being shown in section in Fig. 3. Flues 9 extend completely through both upper and lower sections and through the center of the large tubes 7 so that an annular water space is formed within the tubes 7 around the flues 9. Short flues 10 extend through the lower section 2 only and communicate with the space between the two sections 1 and 2. VFlues 10 extend from the space between the two sections to the dome 18.

A heat insulating material, such as asbestos, 11 is placed around both sections and secured by straps 12. Water is admitted to the lower section 2 through an inlet pipe 13. The steam which accumulates in the section 1 passes through a pipe 14 and is conducted to coils 15 which encircle all the tubes between the two sections 1 and 2 and lie within the asbestos 11. After passing through the coils 15 the steam passes out through pipe 16. A plate 17 is secured to the upper section 1 and forms an air-dome 18 at the top of the boiler. Plate 17 has a gas vent 17.

The iire is located beneath the boiler and the heat passes up through the iiues 9 and also through the short flues 10 into the space between the sections 1 and 2 and outside of the tubes 7 so that heat is applied to both sides of the annular body of water which lies within each tube 7, and the water there- 1n is thus very quickly converted into steam.

the steam rising into the space within the' upper section 1 and thence passing through pipe 14 into the coils 15 where it is dried before it passes out through the pipe 16. The pipes 8 permit the water to circulate from one section to the other. From the space between the two sections the heat passes up through flues 10 into the dome 18 so that the water in the upper section 1 is hea-ted from the flues 9 and also the flues 10.

/Vhat I claim is A boiler comprising a lower section having lower and upper heads, providing a lower water chamber, awater inlet pipe connected with the lower water chamber, an upper section having lower and upper heads, providing an upper water and steam chamber, and spaced from the lower section so as to provide an intermediate heating chamber between the lower and upper sections, a plate having a gas vent and connected with the upper section so as to provide a dome over the latter, a steam pipe extending from the top of the upper water and steam chamber downwardly on the outside thereof to the lower end of the intermediate heating chamber and coiled around the inner wall of the latter to the top thereof and upwardly outside of the upper section, large vertical water tubes extending through the intermediate heating chamber and providing communication between the lower water chamber and the upper water and steam chamber, water circulation pipes also extending through the intermediate heating chamber and also providing communication between the lower water chamber and the upper water and steam chamber, fiues extending completely through the lower section, through the large water tubes and through the upper section, short ues eX- tendg aeross'the lower section into the ntermediate heating chamber, and ues eX- tendng from the intermediate heating cham- 5 ber through the upper Water and Steam chamber and into the dome.

In testimony whereof7 I have hereunto 13th day of September, '1912; l

RGBERT G. FRITZ.

In presence of- I GEO. T. HACKLEY,

VIOLET M. MURRAY.y

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents. Washington, D. C.

set my hand at Los Angeles, Galforllla, this I 

